Nightly CI build for the Rails repo

Daily build with Ruby head

Failed in 6m 58s
:pipeline: rails-nightly-initial-pipeline
:docker: rubylang/ruby:master
Waited 10s
·
Ran in 4m 20s
:docker: rubylang/ruby:master-debug
Waited 7s
·
Ran in 6m 17s
Total Job Run Time: 11m 10s